Public bug reported:

Since new upgrade (2017-02-27 and subsequent) on Ubuntu 18.04 the X-server 
won't start. Many parts of the Nvidia graphics driver 389 are replaced with 390.
Now there's a new file 
/usr/share/X11/xorg.conf.d/nvidia-drm-outputclass-ubuntu.conf of the package 
xserver-xorg-video-nvidia-390 which has some lines, unable to parse from the 
Xorg environment. I comment out these corresponding lines:

Section "OutputClass"
    Identifier "nvidia"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    #Option "AllowEmptyInitialConfiguration"
    #Option "PrimaryGPU" "yes"
    #ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg"
EndSection

But no way to start it, the screen remains empty. There's another behavior 
(compared against all older releases of the nvidia driver):
Normally after bootup the monitor is switching off the background light for a 
second before starting the X-server to display the login screen. Now the 
monitor doesn't switch anything.

** Affects: nvidia-graphics-drivers-390 (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Since new upgrade (2017-02-27 and subsequent) on Ubuntu 18.04 the X-server 
won't start. Many parts of the Nvidia graphics driver 389 are replaced with 390.
  Now there's a new file 
/usr/share/X11/xorg.conf.d/nvidia-drm-outputclass-ubuntu.conf of the package 
xserver-xorg-video-nvidia-390 which has some lines, unable to parse from the 
Xorg environment. I comment out these corresponding lines:
  
  Section "OutputClass"
-     Identifier "nvidia"
-     MatchDriver "nvidia-drm"
-     Driver "nvidia"
-     #Option "AllowEmptyInitialConfiguration"
-     #Option "PrimaryGPU" "yes"
-     #ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg"
+     Identifier "nvidia"
+     MatchDriver "nvidia-drm"
+     Driver "nvidia"
+     #Option "AllowEmptyInitialConfiguration"
+     #Option "PrimaryGPU" "yes"
+     #ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg"
  EndSection
  
- But no way to start it, the screen stays empty. There's another behavior 
(compared against all older releases of the nvidia driver):
+ But no way to start it, the screen remains empty. There's another behavior 
(compared against all older releases of the nvidia driver):
  Normally after bootup the monitor is switching off the background light for a 
second before starting the X-server to display the login screen. Now the 
monitor doesn't switch anything.

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https://bugs.launchpad.net/bugs/1752490

Title:
  X-Server does not start since upgrade to nvidia-390

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